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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]      
Accounts payable $ 803 $ 667  
Accrued liabilities 3,064 2,346  
Long-term debt 14,694 21,453  
Other long-term liabilities 8,384 7,564  
Interest and other financing expense 743 828 $ 912
Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 14,781 $ 21,560  
Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,000    
1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,906    
Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 7,624    
Liquidity risk | Less than 1 year      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 803    
Accrued liabilities 3,064    
Other long-term liabilities 282    
Lease payments included In liablities 185    
Liquidity risk | Less than 1 year | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 1,000    
Interest and other financing expense 650    
Liquidity risk | 1 to less than 2 years      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 181    
Lease payments included In liablities 149    
Liquidity risk | 1 to less than 2 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 2,906    
Interest and other financing expense 583    
Liquidity risk | 2 to less than 5 years      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 430    
Lease payments included In liablities 426    
Liquidity risk | 2 to less than 5 years | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 3,251    
Interest and other financing expense 1,503    
Liquidity risk | Thereafter      
Disclosure of detailed information about financial instruments [line items]      
Accounts payable 0    
Accrued liabilities 0    
Other long-term liabilities 824    
Lease payments included In liablities 824    
Liquidity risk | Thereafter | Gross carrying amount      
Disclosure of detailed information about financial instruments [line items]      
Long-term debt 7,624    
Interest and other financing expense $ 3,971